@AdaMan82, get yourself one of these USB power banks/packs and off you go... if 10Ah is not good enough, go for 20Ah... I have one running my phone when gone dead and I'm off grid... My bank (20Ah) can charge the phone about 3 times... with the speed as the wall power supply that came with the phone... (just know that you cannot run the power through Espruino's USB plug... because you do not want to burn the diode or PCB traces... 'sacrifice' an extra USB cable and feed as your schema displays.
PS: there are other good places for power banks than amazon...
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